Showing papers in "Canadian Journal of Physics in 1979"
TL;DR: In this paper, a mean field theory is developed which is applicable to the orientational behavior of (J = 1) hydrogen molecules on the surface of Grafoil, where the hydrogen molecules are assumed to form a triangular l...
Abstract: A mean field theory is developed which is applicable to the orientational behavior of (J = 1) hydrogen molecules on the surface of Grafoil. The hydrogen molecules are assumed to form a triangular l...
99 citations
TL;DR: In this article, the authors used infrared grating spectroscopy and heterodyne beat frequency detection to measure carbon monoxide laser frequencies in the 5.3 to 7.2μm region.
Abstract: New measurements of carbon monoxide laser frequencies in the 5.3 to 7.2 μm region have been made using the techniques of infrared grating spectroscopy and heterodyne beat frequency detection. The o...
86 citations
TL;DR: The Renner-Teller structure of the and A2Πu states of the CO2+ ion has been studied thanks to the identification and rotational analysis of the vibronic bands associated with th...
Abstract: The Renner–Teller structure of the and A2Πu states of the CO2+ ion has been studied thanks to the identification and rotational analysis of the vibronic bands of the and systems, associated with th...
81 citations
TL;DR: The absorption spectra of HCl and HF have been photographed at high dispersion in the vacuum ultraviolet region as discussed by the authors, and many new band systems have been identified and 18 vibrational l...
Abstract: The absorption spectra of HCl and HF have been photographed at high dispersion in the vacuum ultraviolet region. In the HCl spectrum, many new band systems have been identified and 18 vibrational l...
81 citations
TL;DR: Stopping powers have been measured at common ion velocities v = 0.18 cm ns−1 (v/v0 ǫ = 0.82) and v à 0.22 cm ǔ = 1.01) for all projectiles 6"≤ Z1 1/2≤20 in five solid materials: carbon, alumin...
Abstract: Stopping powers have been measured at common ion velocities v = 0.18 cm ns−1 (v/v0 = 0.82) and v = 0.22 cm ns−1 (v/v0 = 1.01) for all projectiles 6 ≤ Z1 ≤ 20 in five solid materials: carbon, alumin...
78 citations
TL;DR: In this paper, the optical absorption spectrum of the H2S molecule in the region from 2050 to 1150 A has been studied using the radiation from a 1.3-GeV electron synchrotron as a backgro...
Abstract: The optical absorption spectrum of the H2S molecule in the region from 2050 to 1150 A has been studied by a photographic method, using the radiation from a 1.3-GeV electron synchrotron as a backgro...
73 citations
TL;DR: In this paper, the authors deal with optical levitation, which is the possibility of maintaining particles in a stable equilibrium position in air or vacuum by means of laser beams, and they deal with the problem of maintaining the particles in the same position in both air and vacuum.
Abstract: In this article, we are dealing with optical levitation, that is the possibility of maintaining particles in a stable equilibrium position in air or vacuum by means of laser beams.In the first part...
71 citations
TL;DR: In this article, the use of laser-produced free carriers in a semiconductor as a means of controlling infrared radiation is reviewed, and the theory and basic experiments of reflection and transmission switching are presented.
Abstract: The use of laser-produced free carriers in a semiconductor as a means of controlling infrared radiation is reviewed. The theory and basic experiments of reflection and transmission switching are di...
69 citations
TL;DR: The (0, 0, 1, 0), (1, 0) and (1 1 ) bands of the γ′(B3Π-X3Δ) system of TiO have been rotationally analyzed up to J = 55 as discussed by the authors.
Abstract: The (0,0), (1,0), (0,1), and (1,1) bands of the γ′(B3Π–X3Δ) system of TiO have been rotationally analysed up to J = 55 Accurate molecular constants have been determined for the ν = 0and ν = 1 leve
61 citations
TL;DR: In this article, three bands of the C2Σ−←← X2Πi absorption spectrum of 35ClO near 170nm have been photographed at high resolution.
Abstract: Three bands of the C2Σ− ← X2Πi absorption spectrum of 35ClO near 170 nm have been photographed at high resolution. The rotational assignments identify the C state as a 2Σ− Rydberg state. At the pre...
48 citations
TL;DR: In this article, the fundamental vibrational band of the free radical free radical (FO) was detected using the technique of CO2 laser magnetic resonance in the 1025 −1043 cm−1 region.
Abstract: The fundamental vibrational band of the elusive free radical FO has been detected using the technique of CO2 laser magnetic resonance in the 1025–1043 cm−1 region. The FO was produced by a discharge in CF4 gas flowing in a fused quartz (SiO) tube, and the resulting spectra were strong enough to allow the resolution of saturated absorption dips and 19F nuclear hyperfine structure. Seven different CO2 laser lines were used to observe six vibration–rotation transitions, all belonging to the Ω = 3/2 component of the 2Π ground electronic state. The analysis of these observations yielded the first experimental determinations for FO of the rotational constant B, centrifugal distortion constant D, fine structure constant A, and axial hyperfine constant h, as well as the vibrational dependences of B and h. The bond length of FO was found to be re = 1.35789 ± 0.00025 A, which is 1.5 to 2.7% larger than previous values given by ab initio calculations.
TL;DR: The microwave absorption spectrum of the OH X2Π radical has been observed in all vibrational levels up to ν ǫ = 6.6 as discussed by the authors, and the tunable cavity and parallel plate Stark-mo...
Abstract: The microwave absorption spectrum of the OH X2Π radical has been observed in all vibrational levels up to ν = 6. Experimental details are described of the tunable cavity and parallel plate Stark-mo...
TL;DR: In this paper, the combined effects of ion temperature and higher order corrections on ion-acoustic solitary waves are studied on the basis of the reductive perturbation method, and the basic set of fluid equations f...
Abstract: The combined effects of ion temperature and higher order corrections on ion-acoustic solitary waves are studied on the basis of the reductive perturbation method. The basic set of fluid equations f...
TL;DR: In this paper, about 300 rotational transitions in the 6480'A region in the visible absorption of NO2 gas have been assigned by laser-excited fluorescence, and a majority of the stronger transitions belong to the K = 0 and K = 1 subbands of a vibronic band, whose upper state is predominantly an a1 vibrational level of the electronic 2B2 basis state.
Abstract: About 300 rotational transitions in the 6480 A region in the visible absorption of NO2 gas have been assigned by laser-excited fluorescence A majority of the stronger transitions belong to the K = 0 and K = 1 subbands of a vibronic band, T0 = 15 4349 cm−1, whose upper state is predominantly an a1, vibrational level of the electronic 2B2 basis state Other groups of relatively weaker lines form (i) a severely-perturbed K = 2 subband attributed to the same series as the K = 0 and 1 subbands; (ii) a well-developed though relatively weak K = 3 subband assigned to a hybrid level of mainly 2A1, character, the transition to this level being induced by vibronic coupling; and (iii) a K = 6 subband assigned to a parent (ie, 2B2 basis) vibrational level different from that identified at 15 435 cm−1 The spectrum in this region abundantly illustrates the irregularities, 'extra' lines, resonance crossings, and erratic spin splitting now recognized as widespread in the NO2 visible absorption Rotational constants a
TL;DR: In this article, a statistical study was made of the dependence of radio-auroral echoes obtained with the 398 MHz radar at Homer, Alaska on electric fields and election densities measured simultaneously with t...
Abstract: A statistical study has been made of the dependence of radio-auroral echoes obtained with the 398 MHz radar at Homer, Alaska on electric fields and election densities measured simultaneously with t...
TL;DR: In this paper, an expression for the lifetime of a negative ion in a weak and static electric field was derived, and existing experimental data were analyzed to improve the empirical value of the expression.
Abstract: An expression is derived for the lifetime of a negative ion in a weak and static electric field. Using this expression, existing experimental data are analyzed to improve the empirical value of the...
TL;DR: In this paper, a KrF transverse-discharge excimer laser has been mode-locked using several saturable-absorber dyes, achieving a modulation depth of 85%.
Abstract: A KrF transverse-discharge excimer laser has been mode-locked using several saturable-absorber dyes. Pulses of < 2 ns duration and ~1 MW peak power have been obtained showing a modulation depth of 85%.
TL;DR: In this article, the rotational and fine structure parametrization of the PH radical in its X3Σ− and a1Δ states were analyzed. But the analysis of PH radical was limited to a single phase.
Abstract: Measurement and analysis of the 118.6 μm far infrared laser magnetic resonance spectra of the PH radical in its X3Σ− and a1Δ states are reported. The following rotational and fine structure paramet...
TL;DR: A variety of experiments indicate that proteins hardly perturb the orientational order of phospholipids in biological membranes, and it is suggested that, in common with soluble proteins, integral proteins in membranes have a "fluid-like" outer region which provides an approximate fluid mechanical match with the liquid crystalline phospholipped membrane.
Abstract: A variety of experiments indicate that proteins hardly perturb the orientational order of phospholipids in biological membranes. It is suggested that, in common with soluble proteins, integral prot...
TL;DR: In this article, an empirical method is used to separate the indirect energy band gap vs. temperature curve of diamond semiconductor into its constituent lattice dilation and vibrational parts.
Abstract: An empirical method is used to separate the indirect energy band gap vs. temperature curve of diamond semiconductor into its constituent lattice dilation and vibrational parts. The vibrational mech...
TL;DR: In this paper, Shastry has re-examined volumes spanned by spin susceptibility measure-the small r, expansion (which derives from the ranrnents4 (6), this is not an entirely satisfactory pro-dom phase approximation (RPA)) of the spin 'usceptibility of a homogeneous electron gas, xh, a
Abstract: ~h~~~~~i~~l values of the pauli spin susceptibility where non-linear volume dependence should be obxP for the alkali metals, and its volume dependence servable, es~f~~~~l~ in K. Another possible for ~i and N~, were obtained by MacDonald and of error in the MV calculation was their construction vosko (MV) (1) several years ago using a variational of muffin-tin electron densities and potentials from principle developed by vosko and Perdew (VP) (2) self-consistent spherical cell calculations instead of within the framework of spin density functional fully self-consistent augmented plane wave (APW) theory. The adequacy of this approach has by now calculations. been well established (3-5). MacDonald and Vosko In the interim there have been a number of new assumed that the dependence of xP on volume was absolute measurements of Xp (77 8) as as a carelinear in Li and Na and estimated the slope from cal- ful measurement of its volume dependence for K.4 culations at only two volumes. Given the range of On the theoretical side Shastry (9) has re-examined volumes spanned by spin susceptibility measure- the small r, expansion (which derives from the ranrnents4 (6), this is not an entirely satisfactory pro- dom phase approximation (RPA)) of the spin 'usceptibility of a homogeneous electron gas, xh, a
TL;DR: In this paper, the differential cross sections for photon elastic scattering have been determined for targets of Cu, Cd, Ta and Pb, at angles of 2.4, 3.5, 5.1, 6.0, 8.0 and 10.0°.
Abstract: The differential cross sections for photon elastic scattering have been determined for targets of Cu, Cd, Ta, and Pb, at angles of 2.4, 3.5, 5.1., 6.0, 8.0, and 10.0° and incident energies of 244.7...
TL;DR: In this paper, the symmetry group of the Van der Waals complex (H2) 2 or (D2)2 was used to symmetry label the rotation-vibration states and the nuclear spin states of the complexes.
Abstract: The molecular symmetry group of the Van der Waals complex (H2)2 or (D2)2 is a group of order 16 called G16. This group is used to symmetry label the rotation–vibration states and the nuclear spin states of the complexes; the nuclear spin statistical weights are also determined. The group is used to classify the terms in the expansion of the dipole moment function and to determine the symmetry restrictions for allowed electric dipole transitions. The complex H2–D2 has a molecular symmetry group of order 8, G8, and (HD)2 a group of order 4, G4; the energy level symmetries, statistical weights, and selection rules for these complexes are also determined.
TL;DR: Relativistic single-configuration Hartree-Fock computations of ionization energies and oscillator strengths for transitions in principal, sharp, and diffuse series of neutral rubidium and silver sp...
Abstract: Relativistic single-configuration Hartree–Fock computations of ionization energies and oscillator strengths for transitions in principal, sharp, and diffuse series of neutral rubidium and silver sp...
TL;DR: A survey of the magnetic rotation spectrum (MRS) of formaldehyde in the near ultraviolet is reported in this article, where the and bands of the system are also studied under high resolution.
Abstract: A survey of the magnetic rotation spectrum (MRS) of formaldehyde in the near ultraviolet is reported. The and bands of the system are also studied under high resolution. The rR and pP branches of t...
TL;DR: The Raman spectrum of benzene-d6 vapour was excited in a multiple reflection cell by an Ar+ laser and was photographed with a spectral slit width of ~0.15 cm−1 as discussed by the authors.
Abstract: The Raman spectrum of benzene-d6 vapour was excited in a multiple reflection cell by an Ar+ laser and was photographed with a spectral slit width of ~0.15 cm−1. Extensive structure (164 maxima) was...
TL;DR: In this article, a near-coincidence between the 15−14 P(11) line of the 13C18O laser at 1677.228 cm−1 and the 606←← 515 rovibrational t...
Abstract: Laser Stark spectra have been observed in the (020) ← (010) hot band of H216O. A near coincidence between the 15–14 P(11) line of the 13C18O laser at 1677.228 cm−1 and the 606 ← 515 rovibrational t...
TL;DR: In this paper, the authors measured electrical conductivity σ and Hall coefficient RH as a function of temperature in the range room to 500 °C on single crystal n-type tellurium doped samples of GaAs with carrier concentrations in range 7.9Õ× 1021 to 4.7Õ/m3.
Abstract: Measurements of electrical conductivity σ and Hall coefficient RH have been made as a function of temperature in the range room to 500 °C on single crystal n-type tellurium doped samples of GaAs with carrier concentrations in the range 7.9 × 1021 to 4.7 × 1024/m3. Theoretical calculations of σ and RH have been made on a three band (Γ, L, X) model using the method of Fletcher and Butcher and the resulting values fitted to the experimental data by using the temperature coefficients of the band energy differences and various deformation potentials and band coupling coefficients as adjustable parameters. The results confirm the band ordering proposed by Aspnes but give slightly different temperature coefficient values. Values are given for the deformation potentials and band coupling coefficients and in particular the deformation potential of the Γ band is found to be 16.0 ± 0.5 eV.
TL;DR: In this article, ground-based measurements of stratospheric nitrogen dioxide during morning and evening twilight have been made at Lauder, New Zealand, 169°40′E longitude and 45°04′S latitude during January and February.
Abstract: Ground based measurements of stratospheric nitrogen dioxide during morning and evening twilight have been made at Lauder, New Zealand, 169°40′E longitude and 45°04′S latitude during January and Feb...
TL;DR: In this article, a number of optical techniques have been used to characterize optical coatings, but these all utilize only very short optical distances within the film, which is not suitable for characterization.
Abstract: Optical coatings have been in use for decades and a number of optical techniques have been used to characterize them but these all utilize only very short optical distances within the film. Guided ...